这些放大器是用微型电子管制成的。
These amplifiers have long been made with tiny election tubes.
然而近代电子学对调谐的频率范围很宽的带通放大器提出很多要求。
There is a great deal of demand in modern electronics, however, for bandpass amplifiers .
这些放大器是用微型电子管制成的。
These amplifiers have long been made with tiny election tubes .
这些放大器是用微型电子管制成的。
These amplifiers have long been made with tiny election tubes .
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